vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
182 lines
6.8 KiB
C++
182 lines
6.8 KiB
C++
/* Copyright (C) 2022 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Describes ground via heightmap and array of CPatch.
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*/
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#ifndef INCLUDED_TERRAIN
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#define INCLUDED_TERRAIN
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#include "graphics/HeightMipmap.h"
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#include "graphics/SColor.h"
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#include "maths/Fixed.h"
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#include "maths/Vector3D.h"
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#include "ps/CStr.h"
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class CPatch;
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class CMiniPatch;
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class CFixedVector3D;
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class CBoundingBoxAligned;
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///////////////////////////////////////////////////////////////////////////////
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// Terrain Constants:
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/// metres [world space units] per tile in x and z
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const ssize_t TERRAIN_TILE_SIZE = 4;
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/// number of u16 height units per metre
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const ssize_t HEIGHT_UNITS_PER_METRE = 92;
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/// metres per u16 height unit
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const float HEIGHT_SCALE = 1.f / HEIGHT_UNITS_PER_METRE;
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///////////////////////////////////////////////////////////////////////////////
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// CTerrain: main terrain class; contains the heightmap describing elevation
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// data, and the smaller subpatches that form the terrain
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class CTerrain
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{
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public:
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CTerrain();
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~CTerrain();
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// Coordinate naming convention: world-space coordinates are float x,z;
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// tile-space coordinates are ssize_t i,j. rationale: signed types can
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// more efficiently be converted to/from floating point. use ssize_t
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// instead of int/long because these are sizes.
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bool Initialize(ssize_t patchesPerSide, const u16* ptr);
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// return number of vertices along edge of the terrain
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ssize_t GetVerticesPerSide() const { return m_MapSize; }
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// return number of tiles along edge of the terrain
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ssize_t GetTilesPerSide() const { return GetVerticesPerSide()-1; }
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// return number of patches along edge of the terrain
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ssize_t GetPatchesPerSide() const { return m_MapSizePatches; }
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float GetMinX() const { return 0.0f; }
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float GetMinZ() const { return 0.0f; }
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float GetMaxX() const { return (float)((m_MapSize-1) * TERRAIN_TILE_SIZE); }
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float GetMaxZ() const { return (float)((m_MapSize-1) * TERRAIN_TILE_SIZE); }
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bool IsOnMap(float x, float z) const
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{
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return ((x >= GetMinX()) && (x < GetMaxX())
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&& (z >= GetMinZ()) && (z < GetMaxZ()));
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}
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float GetVertexGroundLevel(ssize_t i, ssize_t j) const;
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fixed GetVertexGroundLevelFixed(ssize_t i, ssize_t j) const;
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float GetExactGroundLevel(float x, float z) const;
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fixed GetExactGroundLevelFixed(fixed x, fixed z) const;
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float GetFilteredGroundLevel(float x, float z, float radius) const;
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// get the approximate slope of a tile
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// (0 = horizontal, 0.5 = 30 degrees, 1.0 = 45 degrees, etc)
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fixed GetSlopeFixed(ssize_t i, ssize_t j) const;
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// get the precise slope of a point, accounting for triangulation direction
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fixed GetExactSlopeFixed(fixed x, fixed z) const;
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// Returns true if the triangulation diagonal for tile (i, j)
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// should be in the direction (1,-1); false if it should be (1,1)
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bool GetTriangulationDir(ssize_t i, ssize_t j) const;
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// Resize this terrain such that each side has given number of patches,
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// with the center offset in patches from the center of the source.
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void ResizeAndOffset(ssize_t size, ssize_t horizontalOffset = 0, ssize_t verticalOffset = 0);
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// set up a new heightmap from 16 bit data; assumes heightmap matches current terrain size
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void SetHeightMap(u16* heightmap);
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// return a pointer to the heightmap
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u16* GetHeightMap() const { return m_Heightmap; }
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// get patch at given coordinates, expressed in patch-space; return 0 if
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// coordinates represent patch off the edge of the map
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CPatch* GetPatch(ssize_t i, ssize_t j) const;
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// get tile at given coordinates, expressed in tile-space; return 0 if
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// coordinates represent tile off the edge of the map
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CMiniPatch* GetTile(ssize_t i, ssize_t j) const;
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// calculate the position of a given vertex
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void CalcPosition(ssize_t i, ssize_t j, CVector3D& pos) const;
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void CalcPositionFixed(ssize_t i, ssize_t j, CFixedVector3D& pos) const;
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// calculate the vertex under a given position (rounding down coordinates)
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static void CalcFromPosition(const CVector3D& pos, ssize_t& i, ssize_t& j)
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{
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i = (ssize_t)(pos.X/TERRAIN_TILE_SIZE);
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j = (ssize_t)(pos.Z/TERRAIN_TILE_SIZE);
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}
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// calculate the vertex under a given position (rounding down coordinates)
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static void CalcFromPosition(float x, float z, ssize_t& i, ssize_t& j)
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{
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i = (ssize_t)(x/TERRAIN_TILE_SIZE);
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j = (ssize_t)(z/TERRAIN_TILE_SIZE);
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}
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// calculate the normal at a given vertex
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void CalcNormal(ssize_t i, ssize_t j, CVector3D& normal) const;
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void CalcNormalFixed(ssize_t i, ssize_t j, CFixedVector3D& normal) const;
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CVector3D CalcExactNormal(float x, float z) const;
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// Mark a specific square of tiles (inclusive lower bound, exclusive upper bound)
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// as dirty - use this after modifying the heightmap.
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// If you modify a vertex (i,j), you should dirty tiles
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// from (i-1, j-1) [inclusive] to (i+1, j+1) [exclusive]
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// since their geometry depends on that vertex.
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// If you modify a tile (i,j), you should dirty tiles
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// from (i-1, j-1) [inclusive] to (i+2, j+2) [exclusive]
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// since their texture blends depend on that tile.
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void MakeDirty(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1, int dirtyFlags);
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// mark the entire map as dirty
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void MakeDirty(int dirtyFlags);
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/**
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* Returns a 3D bounding box encompassing the given vertex range (inclusive)
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*/
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CBoundingBoxAligned GetVertexesBound(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1);
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// get the base color for the terrain (typically pure white - other colors
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// will interact badly with LOS - but used by the Actor Viewer tool)
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SColor4ub GetBaseColor() const { return m_BaseColor; }
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// set the base color for the terrain
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void SetBaseColor(SColor4ub color) { m_BaseColor = color; }
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const CHeightMipmap& GetHeightMipmap() const { return m_HeightMipmap; }
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private:
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// delete any data allocated by this terrain
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void ReleaseData();
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// setup patch pointers etc
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void InitialisePatches();
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// size of this map in each direction, in vertices; ie. total tiles = sqr(m_MapSize-1)
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ssize_t m_MapSize;
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// size of this map in each direction, in patches; total patches = sqr(m_MapSizePatches)
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ssize_t m_MapSizePatches;
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// the patches comprising this terrain
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CPatch* m_Patches;
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// 16-bit heightmap data
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u16* m_Heightmap;
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// base color (usually white)
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SColor4ub m_BaseColor;
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// heightmap mipmap
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CHeightMipmap m_HeightMipmap;
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};
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#endif // INCLUDED_TERRAIN
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